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DWR is easy Ajax for Java. It makes it simple to call Java code directly from Javascript. It gets rid of almost all the boilerplate code between the web browser and your Java code. This version 4.0.2 works with Jakarta Servlet 4.0.2.

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package org.directwebremoting.servlet;

/**
 * A handler for interface generation requests compatible with AMD format.
 * @author Mike Wilson
 */
public class AmdInterfaceHandler extends BaseInterfaceHandler
{
    /* (non-Javadoc)
     * @see org.directwebremoting.servlet.BaseInterfaceHandler#getBaseInterfacePath()
     */
    @Override
    protected String getBaseInterfacePath()
    {
        return amdInterfaceHandlerUrl;
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.servlet.BaseInterfaceHandler#generateInterface(java.lang.String, java.lang.String)
     */
    @Override
    public String generateInterfaceScript(String contextPath, String servletPath, String scriptName)
    {
        AmdModule mod = new AmdModule(contextPath, servletPath);
        mod.addDependency(amdDwrBaseModulePath, "engine", "dwr");

        mod.addContent("  var p;\n");
        mod.addContent("\n");

        // Add standard interface contents
        mod.addContent(remoter.generateInterfaceJavaScript(scriptName, "  ", "p", contextPath + servletPath));

        mod.addContent("\n");
        mod.addContent("  return p;\n");

        return mod.toString();
    }

    /**
     * Setter for the URL that this handler is available on
     * @param url the url to set
     */
    public void setAmdInterfaceHandlerUrl(final String url)
    {
        amdInterfaceHandlerUrl = url;
    }

    /**
     * Setter for the module path that dwr.engine is on
     * @param modulePath the modulePath to set
     */
    public void setAmdDwrBaseModulePath(final String modulePath)
    {
        amdDwrBaseModulePath = modulePath;
    }

    /**
     * What URL is this handler available on?
     */
    protected String amdInterfaceHandlerUrl;

    /**
     * What module path is dwr.engine on?
     */
    protected String amdDwrBaseModulePath;
}